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mustry

prov that sin3A=?

  • one year ago
  • one year ago

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  1. hba
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    This is not a proof ?

    • one year ago
  2. hba
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    sin3A= something which we have to prove ?

    • one year ago
  3. hba
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    @mustry Please reply ?

    • one year ago
  4. ajprincess
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    Prove sin3A=? sin3A=sin(A+2A) use sin(A+B)=sinAcosB+cosAsinB sin2A=2sinAcosA

    • one year ago
  5. mustry
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    good

    • one year ago
  6. mustry
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    actually u know

    • one year ago
  7. mustry
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    no ur suppose to expand it

    • one year ago
  8. mustry
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    sin(2A+A)=sin2AcosA+cos2AsinA

    • one year ago
  9. mustry
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    BUT cos2A=cos^A+sin^A

    • one year ago
  10. ajprincess
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    cos2A=cos^2A-sin^2A =1-2sin^2A =2cos^2A-1

    • one year ago
  11. mustry
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    OKAY put it in the equestn

    • one year ago
  12. mustry
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    ur r8

    • one year ago
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